How is the Heap data structure inside the Java Virtual Machine organized?

The Java Virtual Machine (JVM) uses a heap as a memory area for dynamic object allocation during program execution.

The Heap structure in JVM is usually divided into several parts:

• Young Generation: where new objects are created. It consists of Eden and two Survivor spaces. Objects that survive multiple garbage collections are moved to the Old Generation.
• Old Generation: for objects with a long lifespan.
• Permanent Generation (or Metaspace in newer versions): stores class metadata and other administrative information.

The heap is managed by a garbage collector, which frees memory by removing unused objects. This organization allows efficient memory management and performance optimization.

Here's an example:

Heap {
  Young Generation {
    Eden
    Survivor 1
    Survivor 2
  }
  Old Generation
  Metaspace (not always considered part of the Heap)
}